I 0 items Heery and Molloy Papers, 1907-1923 88 items Helen Hooker O'Malley Roelofs Collection 1230 items Henning Christoph Collection, PC Collection-level description only Henry Arthur Shuckburgh Upton Papers, 1880-1940 13 items Henry Dixon papers, 1880-1928 62 items Henry J. Hadden Papers, 1887-1915 15 items Herbert Collection (PD 1981 TX) [graphic] 13 items Herbert Davies Photographic Collection Collection-level description only Hibernian Mining Company Papers, 1617-1952 97 items Hogan Photographic Collection 230 items Hogan-Wilson Collection 197 items Holloway Book Collection 3207 items Holloway Playbills Collection 102 items Holroyd-Smyth Family Papers, 1618-1965 149 items Home Rule Postcards Photographic Collection 2 items Howth Castle Papers 47 items Hugh Kennedy archive, 1676 and 1881-1963 9 items Hugh Leonard papers, 1940-1996 Collection-level description only Hugo Hamilton Papers, 1951-2009 303 items Hutton Family Photographic Collection Collection-level description only